Macro- Large; Great

Macrocosm- the great world or universe; the universe considered as a whole
Macroscopic- visible to the human eye

Maj- Bigger, taller, larger

Majesty- supreme greatness or authority

Mas- large, excessive

Amass- to gather for oneself; collect as one's own

Max- greatest, biggest, largest

Climax- the highest or most intense point in the development or resolution of something; culmination
Maxim- a principle or rule of conduct

Und- wave, surge

Undulate- move with a smooth wave like motion
Undulant- having a rising or falling motion or appearance like that of waves
Undue- unwarranted or excessive